2nd time here. Got thinking about it hard. Its like this: I am 68. I had many good times in the past and frankly, most of them CANT be repeated! That is because first, the people I had them with are all dead! (or feeble).
Next, for a lot of the incidents I was in better shape just to be there, and maybe being "single" was also a big factor.
I like the same things now as I did 50 to 60 years ago. That is guns, flying, motorcycles, traveling, gambling and being with old friends and relatives. Well, I have fast ran out of old relatives, friends all moved, or I did, also they all got civilised too.
The lesson here is do a lot more of what you like while you can and have the means and ability to.